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What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 #264979
07/15/09 11:45 pm
07/15/09 11:45 pm
Joined: Dec 2006
Posts: 536
Folsom, CA
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yellow_cad Offline OP
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Looks like it is BP8;is that correct?


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
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Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: yellow_cad] #264987
07/16/09 12:57 am
07/16/09 12:57 am
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Florida TR6 Offline
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Yelllow-cad: They came with Champion N3 and there are experts here who swear by them. The N4 Champion is a hotter plug. Some favor NGK B7ES (what I use), or the cooler B8ES (more prone to fouling) -- basing the decision on several factors, including what works best for them. The web site below (see page 39-- warning, a Harley site) has an interesting brief perspective on Champion N3 and N4 heat range differences. Loads of info. on plugs, plug chops and plug reading on this web site. Good luck.

Maintenance incl. info on Champion plugs


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Florida TR6] #264989
07/16/09 1:10 am
07/16/09 1:10 am
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P.S. The "Read 'Em and Weep" on page 39 of the web site is worth a read. For that matter, the whole section on spark plugs (pages 38-40) contains some useful information. The experts here are the best source of info. Not sure they would agree with all that is provided in the article.


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Florida TR6] #265026
07/16/09 5:27 am
07/16/09 5:27 am
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Folsom, CA
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yellow_cad Offline OP
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If my motor is a fresh rebuild, would you think that the 8 range might be better since this is closer to the stock recommendation? If I were to go to Iridiums, would it be 8 or 7 heat range?


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: yellow_cad] #265035
07/16/09 8:54 am
07/16/09 8:54 am
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Stuart Offline
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Hi,

Originally Posted By: yellow_cad
Looks like it is BP8;is that correct?

The 'P' indicates a 'p'rojector (extended tip) plug, so not quite. Digressing slightly, an 'R' before the number indicates a resistor plug - to be avoided unless specifically required by an electronic ignition.

Originally Posted By: yellow_cad
If my motor is a fresh rebuild, would you think that the 8 range might be better since this is closer to the stock recommendation?

Ime and mho, no.

As said above, Bonnies came originally with Champion N3, NGK equivalent B8ES; however, these are quite 'cool' plugs, because the engine is 'hot' - i.e. in a relatively high state of tune. As also stated above, this makes them more prone to fouling; this can be for a number of reasons, one of which is not regularly using a lot of the engine rev. range. By definition, you aren't going to be doing that for at least a few hundred miles? wink So I'd be inclined to at least start out with N4 or B7ES.

Originally Posted By: yellow_cad
If I were to go to Iridiums, would it be 8 or 7 heat range?

From my experience here in GB - to start out with, I wouldn't bother. They're very expensive compared to the normal plugs and, until you've run the engine in, worked out your riding style and the properties of whatever fuel you choose to use, you risk having to throw away what might be the wrong plugs. frown

If you eventually decide you want to try Iridiums, ime go for the N3- or B8-equivalents - any of the unobtanium/costalotium plugs have a much wider heat range than the equivalent 'ordinaries', so are much more tolerant of bouts of low-engine-speed riding, seasonal changes in local fuel mixes, yadda, yadda. And, ime, you get a couple of extra mpg. bigt

Hth.

Regards,

Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Stuart] #265067
07/16/09 2:49 pm
07/16/09 2:49 pm
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Folsom, CA
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yellow_cad Offline OP
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yellow_cad  Offline OP
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Originally Posted By: Stuart


Originally Posted By: yellow_cad
Looks like it is BP8;is that correct?

The 'P' indicates a 'p'rojector (extended tip) plug, so not quite. Digressing slightly, an 'R' before the number indicates a resistor plug - to be avoided unless specifically required by an electronic ignition.



Is a resistor plug required by an older Boyer unit?


Jim

1970 Triumph Bonneville
1973 Commando Interstate
1971 OSSA MAR
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: yellow_cad] #265095
07/16/09 4:22 pm
07/16/09 4:22 pm
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Posts: 731
Melbourne Fl
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Terry_tr6 Offline
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no resistor needed for the analog boyers. also podtronics regulator does not require one(emphatically so in email from them), Sparkz regulator DOES require resistor

Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Terry_tr6] #265107
07/16/09 5:27 pm
07/16/09 5:27 pm
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Emsworth, sunny south of Engla...
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dave jones Offline
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I use B7ES. It is a between an N3 and N4 Champion as they are not perfect eqivalents so you actually have a range of four that you can use if you use both makes. They go N4 B7ES N3 B8ES. B7E was the NGK Triumph recommended if you couldn't get an N3, according to a service sheet.

Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: dave jones] #265149
07/16/09 7:56 pm
07/16/09 7:56 pm
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The plugs should be the coldest possible range which do not foul.
As Stuart states, Iridium do not foul as easily as ordinary plugs, which is why I think they are the right type of plugs to use, because you can choose a lower heat range, without experiencing problems.
I started out with Denso IW22(NGK 7 range) but decided to try out the colder one IW24(NGK 8 range) and it had no fouling effect, even though it runs quite rich in some areas.
As I see it, there are 2 downsides to Iridium.
1. It could potentially "hide" a rich running condition.
(But if you check your plugs, youŽd see it)
2. The price.
(But how often do you change plugs...)


*******************
Run `em...
*******************
1969 T120
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Ducknaldo] #265157
07/16/09 8:25 pm
07/16/09 8:25 pm
Joined: Mar 2005
Posts: 10,175
Boston, Massachusetts
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John Healy Online content

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Boston, Massachusetts
Quote:
Sparkz regulator DOES require resistor


Clarification:
Sparx single phase regulators do not require resistor caps.

Sparx three phase regulators have had over charging problems on some installations when not used with resistor caps.
John


Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: John Healy] #265351
07/17/09 6:41 pm
07/17/09 6:41 pm
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Posts: 162
USA
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Tigerguy Offline
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I ran Champion N3s in my 1970 Tiger, and yesterday pulled them in anticipation of a 180 mile run on Saturday. They looked just a little sooty so I changed to a pair of NGK B7ES, which I gapped at .025. Couldn't find N4s at the nearby bike shop but if the B7ES run sooty also I'll look at the jetting - I forget what size main jet I have - and maybe the next hotter plug.

Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: Tigerguy] #265391
07/17/09 8:19 pm
07/17/09 8:19 pm
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Posts: 7,421
Back on the mainland!
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My bike also requires N3's. I have run N3's, B7;s and B8's....

I found the NGK7's to be a bit hotter than the Champ N3's and the NGK8's a bit too cool for me.....my current N3's have about 2,000 miles on them...working like a, wait for it......champ!! laughing

Caveat emptor: My style of riding is on empty secondary roads, somewhere between 50 - 70 mph....you should factor in your style of riding when selecting plugs....

If the motor is a fresh rebuild, even with the pea-soup they call gas these days, I'd run the recommended N3's for break in....

My 2c

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
Re: What is the correct NGK spark plug for a 1970 Triumph Bonneville 650 [Re: John Healy] #265531
07/18/09 4:39 pm
07/18/09 4:39 pm
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Melbourne Fl
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i should have specified this was for the 3-phase sparkz unit.
Their web page does specify that you need the 5k resistor. unfortunately the documentation, at least what came in my box, said nothing about it. caused me quite a bit of troubleshooting until i discovered the solution(with help from this web site i might add).


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